The current trend to ensure results is to work with concentrations between 1500 and 2000 million. We all know that a female can get pregnant with less concentration, but the conditions of the farm change every day, so every day something happens. A higher concentration helps us to achieve the necessary constant good results. It also takes time to work with larger volumes as there has been better results, 50 to 60 ml per dose. There are many centers that are working with doses of 60 cc and 1800 million sperm.